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Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks

From: BALATON Zoltan
Subject: Re: [Qemu-devel] Commit 77af8a2b95b79699de650965d5228772743efe84 breaks Windows 2000 support
Date: Fri, 21 Jul 2017 12:50:10 +0200 (CEST)
User-agent: Alpine 2.21 (BSF 202 2017-01-01)

On Fri, 21 Jul 2017, Igor Mammedov wrote:
On Fri, 21 Jul 2017 10:20:26 +0100
"Daniel P. Berrange" <address@hidden> wrote:
On Thu, Jul 20, 2017 at 09:29:33PM +0200, Phil Dennis-Jordan wrote:
On Thu, Jul 20, 2017 at 6:40 PM, Programmingkid
<address@hidden> wrote:
I noticed that Windows 2000 does not boot up in QEMU recently. After bisecting 
the issue I found the offending commit:

Ouch. I reckon we have 2 options for fixing this:

1. Export two FADTs, one ACPI 1.0, one ACPI 2.0. The latter would need
to be pointed to by an XSDT, which Qemu currently doesn't implement at
all as far as I'm aware. Any ideas on how SeaBIOS or OVMF would handle
this? Any likely other OS regressions?

2. Select FADT version with an option. This one is definitely safe,
but adds yet another option.


The original comit below claims the change does not impact guest ABI
compatibility, so do we understand why Windows broke ?
Author made a reasonable effort to test with variety of guest OSes upto
vanilla WinXP, we can't blame ourselves for not testing OS that's is not

Well we don't know why w2k breaks, only that it bisects to this commit.

I don't know if this helps but I've found that this same commit also broke booting OS X on q35 with OVMF and Clover (some old versions I had and worked before this commit). See here:

Maybe it's simpler to debug as these are open source but it's still not very clear why they fail because it starts to boot OS X but hangs during kernel init (and maybe Win2K fails to boot because of something else). I think I've seen this with OVMF 58f025afd and Clover 3354 (or around that, not completely sure about these versions).


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